common: Drop asm/global_data.h from common header

Move this out of the common header and include it only where needed.  In
a number of cases this requires adding "struct udevice;" to avoid adding
another large header or in other cases replacing / adding missing header
files that had been pulled in, very indirectly.   Finally, we have a few
cases where we did not need to include <asm/global_data.h> at all, so
remove that include.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>

include/pwm.h

@@ -10,6 +10,8 @@
 #ifndef _pwm_h_
 #define _pwm_h_
 
+struct udevice;
+
 /* struct pwm_ops: Operations for the PWM uclass */
 struct pwm_ops {
 	/**